Hi Ozan,
On 11/22/25 2:18 PM, Ozan Durgut wrote:
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Dear U-Boot maintainers,
I hope you're doing well.
I would like to raise a backward compatibility concern regarding commit
fb5235239aad ("env: Rename DEFAULT_ENV_FILE to
ENV_DEFAULT_ENV_TEXT_FILE"), which landed in the v2025.10 release.
I don't think we ever advertised backward compatibility for Kconfig
symbols/defconfig.
Previously used Kconfig symbols CONFIG_USE_DEFAULT_ENV_FILE and
CONFIG_DEFAULT_ENV_FILE have been replaced with
CONFIG_ENV_USE_DEFAULT_ENV_TEXT_FILE and
CONFIG_ENV_DEFAULT_ENV_TEXT_FILE. However, the old symbols were removed
outright, without a compatibility shim or deprecation period.
This change causes breakage when integrating U-Boot with Buildroot, as
Buildroot currently lacks a mechanism to handle such changes
conditionally based on U-Boot's version. As a result, downstream users
are forced to choose between breaking support for older or newer U-Boot
versions.
Currently yes, but that's an issue in Buildroot you can fix. This was
already asked on #u-boot and I already answered "just enable the new
option as well?"
(https://libera.catirclogs.org/u-boot/2025-11-20#39059950;). I've sent a
patch to the Buildroot ML with a tentative patch (though it doesn't seem
to appear on the ML archive just yet for some reason):
commit 73889fc15e1d631adc24a88e59f839569fe803dc
Author: Quentin Schulz <[email protected]>
Date: Mon Nov 24 13:20:44 2025 +0100
boot/uboot: fix externally provided env file not used on 2025.10
fb5235239aad ("env: Rename DEFAULT_ENV_FILE to
ENV_DEFAULT_ENV_TEXT_FILE") renamed the Kconfig symbols and thus we
need
to adapt the U-Boot package in Buildroot to support it.
Fixes: 128c26f2875d ("boot/uboot: bump to version 2025.10")
Reported-by: Ozan Durgut <[email protected]>
Signed-off-by: Quentin Schulz <[email protected]>
diff --git a/boot/uboot/uboot.mk b/boot/uboot/uboot.mk
index 7bd0937df2..8dad710bf3 100644
--- a/boot/uboot/uboot.mk
+++ b/boot/uboot/uboot.mk
@@ -409,8 +409,12 @@ UBOOT_KCONFIG_OPTS = $(UBOOT_MAKE_OPTS)
HOSTCC="$(HOSTCC_NOCCACHE)" HOSTLDFLAGS=
ifeq ($(BR2_TARGET_UBOOT_DEFAULT_ENV_FILE_ENABLED),y)
UBOOT_DEFAULT_ENV_FILE = $(call
qstrip,$(BR2_TARGET_UBOOT_DEFAULT_ENV_FILE))
define UBOOT_KCONFIG_DEFAULT_ENV_FILE
+ # Pre-2025.10
$(call KCONFIG_SET_OPT,CONFIG_USE_DEFAULT_ENV_FILE,y)
$(call KCONFIG_SET_OPT,CONFIG_DEFAULT_ENV_FILE,"$(shell readlink -f
$(UBOOT_DEFAULT_ENV_FILE))")
+ # 2025.10 and later
+ $(call KCONFIG_SET_OPT,CONFIG_ENV_USE_DEFAULT_ENV_TEXT_FILE,y)
+ $(call KCONFIG_SET_OPT,CONFIG_ENV_DEFAULT_ENV_TEXT_FILE,"$(shell
readlink -f $(UBOOT_DEFAULT_ENV_FILE))")
endef
endif
endif # BR2_TARGET_UBOOT_BUILD_SYSTEM_LEGACY
Cheers,
Quentin
